罗痛定对脑缺血/再灌注损伤大鼠器官组织一氧化氮合酶的影响

目的观察大鼠脑缺血/再灌注（I/R）损伤不同阶段肺、肝、肾组织一氧化氮合酶（NOS）的活性变化,探讨罗痛定的作用机制。方法选择76只SD大鼠,按改良的四血管阻塞法建立脑I/R损伤模型。随机分为假手术组、I/R损伤组和罗痛定治疗组,后两组分别于再灌注2、6、12、24和48h处死大鼠,测定肺、肝、肾组织不同类型NOS活性。结果I/R损伤组总NOS（tNOS）活性于再灌注2、12和24h均较假手术组显著升高（P〈0.05或P〈0.01）,尤以12h时上升最显著（P均〈0.01）;2h时以结构型NOS（cNOS）活性上升为主（P均〈0.05）;12h时以诱生型NOS（iNOS）活性上升为主（P均〈0.01）,至24h仍较高（P均〈0.05）,48h时基本接近假手术组水平。与I/R损伤组比较,罗痛定治疗组各组织cNOS活性在2h时上升更显著（P均〈0.05）,iNOS在12h以后明显下降（P〈0.05或P〈0.01）。结论在脑I/R损伤不同阶段肺、肝、肾组织中不同类型NOS活性不同,发挥作用不同;罗痛定可以通过调节不同类型NOS活性减轻组织损伤。

Effects of rotundine injection on nitric oxide synthase in tissues of different organs after ischemia/reperfusion of brain in rats

OBJECTIVE: To explore the protective effect of rotundine injection on lung, liver and kidney damages after cerebral ischemia/reperfusion (I/R) injury in rats based on the activity changes of nitric oxide synthase (NOS). METHODS: Seventy-six rats were randomly divided into three groups: sham operation group, I/R injury group and treatment group, and determinations were done at five different time points. The cerebral I/R models were reproduced by improved 4 vessels occlusion method. The activities of NOS in the lung, liver and kidney were measured in all the rats at 2, 6, 12, 24 and 48 hours after reperfusion. RESULTS: Compared with sham operation group, the activities of total NOS (tNOS) were significantly increased at 2, 12 and 24 hours in I/R injury group (P<0.05 or P<0.01), with the peak value at 12 hours (all P<0.01). The activities of constitutive NOS (cNOS) were increased significantly at 2 hours (all P<0.05), and those of induced NOS (iNOS) were increased at 12 hours (all P<0.01). The activities of iNOS were still high at 24 hours (all P<0.05), and approached the levels of sham operation group at 48 hours. Compared with I/R injury group, the activities of cNOS in various organs increased much higher at 2 hours in treatment group (all P<0.05). But those of iNOS were significantly decreased after 12 hours (P<0.05 or P<0.01). CONCLUSION: The various types of NOS play different roles in the lung damages after brain I/R injury at different stages in rats. Rotundine injection can ameliorate the damages by modulating the activities of different types of NOS.